Demonstrating the decoupling regime of the electron-phonon interaction in a quantum dot using chirped optical excitation

Excitation of a semiconductor quantum dot with a chirped laser pulse allows excitons to be created by rapid adiabatic passage. In quantum dots this process can be greatly hindered by the coupling to phonons. Here we add a high chirp rate to ultra-short laser pulses and use these pulses to excite a s...

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Published inarXiv.org
Main Authors Kaldewey, Timo, Lüker, Sebastian, Kuhlmann, Andreas V, Valentin, Sascha R, Chauveau, Jean-Michel, Ludwig, Arne, Wieck, Andreas D, Reiter, Doris E, Kuhn, Tilmann, Warburton, Richard J
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 16.03.2017
Subjects
Adiabatic flow
Coupling
Decoupling
Electron phonon interactions
Electrons
Excitation
Excitons
Phonons
Physics - Mesoscale and Nanoscale Physics
Physics - Optics
Physics - Quantum Physics
Quantum dots
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Summary:Excitation of a semiconductor quantum dot with a chirped laser pulse allows excitons to be created by rapid adiabatic passage. In quantum dots this process can be greatly hindered by the coupling to phonons. Here we add a high chirp rate to ultra-short laser pulses and use these pulses to excite a single quantum dot. We demonstrate that we enter a regime where the exciton-phonon coupling is effective for small pulse areas, while for higher pulse areas a decoupling of the exciton from the phonons occurs. We thus discover a reappearance of rapid adiabatic passage, in analogy to the predicted reappearance of Rabi rotations at high pulse areas. The measured results are in good agreement with theoretical calculations.
ISSN:2331-8422
DOI:10.48550/arxiv.1701.01304